[fasta] Add and correct even more offsets

pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Note: copied from package:kernel at revision 7346348.
 
 /// A library to help transform compounds and null-aware accessors into
 /// let expressions.
 library kernel.frontend.accessors;
 
@@ skipping 408 matching lines @@
   }
 
   Expression _finish(Expression body) {
     return makeLet(indexVariable, body);
   }
 }
 
 class StaticAccessor extends Accessor {
   Member readTarget;
   Member writeTarget;
+  int charOffset;
 
-  StaticAccessor(this.readTarget, this.writeTarget);
+  StaticAccessor(this.readTarget, this.writeTarget, this.charOffset);
 
   _makeRead() =>
-      readTarget == null ? makeInvalidRead() : new StaticGet(readTarget);
+      readTarget == null ? makeInvalidRead() : new StaticGet(readTarget)
+        ..fileOffset = charOffset;
 
   _makeWrite(Expression value, bool voidContext) {
     return writeTarget == null
         ? makeInvalidWrite(value)
-        : new StaticSet(writeTarget, value);
+        : new StaticSet(writeTarget, value)..fileOffset = charOffset;
   }
 }
 
 class ReadOnlyAccessor extends Accessor {
   Expression expression;
   VariableDeclaration value;
 
   ReadOnlyAccessor(this.expression);
 
   _makeSimpleRead() => expression;
@@ skipping 29 matching lines @@
 
 VariableDeclaration makeOrReuseVariable(Expression value) {
   // TODO: Devise a way to remember if a variable declaration was reused
   // or is fresh (hence needs a let binding).
   return new VariableDeclaration.forValue(value);
 }
 
 Expression wrapInvalid(Expression e) {
   return new Let(new VariableDeclaration.forValue(e), new InvalidExpression());
 }